CN109831810B - Method and device for establishing wireless access bearer - Google Patents
Method and device for establishing wireless access bearer Download PDFInfo
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- CN109831810B CN109831810B CN201711185541.6A CN201711185541A CN109831810B CN 109831810 B CN109831810 B CN 109831810B CN 201711185541 A CN201711185541 A CN 201711185541A CN 109831810 B CN109831810 B CN 109831810B
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Abstract
The embodiment of the invention provides a method and a device for establishing a wireless access bearer, wherein the method is applied between a base station and a terminal, and the base station comprises a source base station and a target base station; the method comprises the following steps: when the source base station fails to establish a wireless access bearer with the terminal, the target base station receives a switching request sent by the source base station; the version number of the communication protocol used by the switching request is higher than that used by the target base station; the target base station returns a switching request confirmation signaling to the source base station; the source base station is used for sending a base station switching command to the terminal based on the switching request confirmation signaling; the target base station initiates a request for establishing a wireless access bearer to the terminal; the terminal is used for establishing a wireless access bearer with the target base station according to the request for establishing the wireless access bearer; and the target base station receives a feedback result of successful establishment of the wireless access bearer returned by the terminal. The embodiment of the invention avoids the situation that the ERAB flow needs to be reestablished from the beginning in the prior art.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for establishing a radio access bearer.
Background
In an LTE wireless communication system, a terminal needs to establish an era (Evolved Radio access bearer) bearer for performing a service, and the terminal needs to switch between different cells to ensure service continuity with the continuous change of the geographical position of the terminal.
In an actual scenario, the ERAB bearer establishment and handover may occur concurrently, that is, in the course of the ERAB bearer establishment, the terminal reports a measurement report to perform mobility handover. At this time, the ERAB bearer establishment procedure needs to be terminated first, and then the mobility handover is executed; in this process, since there is no feedback waiting for the terminal, the eNB (Evolved Node B) considers that the terminated ERAB bearer establishment procedure is failed, and the eNB may notify the core network that the ERAB bearer establishment is failed. For the terminal, the ERAB bearer establishment may be successful or may fail. When the terminal is switched to a target cell, an MME (Mobility Management Entity) initiates establishment of the same ERAB bearer again, and when the eNB configures the terminal, the terminal considers that the configuration is wrong because the terminal has successfully established the ERAB bearer information and reconfigures the same bearer resource, the terminal initiates re-establishment, and finally the ERAB bearer establishment fails.
Referring to fig. 1, a conventional procedure for processing the case where an ERAB bearer is established and handed over concurrently is as follows:
1) MME sends a bearer SETUP REQUEST (ERAB SETUP REQUEST) to the source eNB;
2) the source eNB sends RRC connection reconfiguration (RRCConnectionReconfiguration) to the terminal to establish DRB;
3) the source eNB receives a measurement report (MeasurementReport) of the terminal;
4) the source eNB sends a bearer SETUP RESPONSE (ERAB SETUP RESPONSE) to the MME to indicate that the ERAB bearer SETUP fails;
5) the source eNB sends a HANDOVER REQUEST (HANDOVER REQUEST) to the destination eNB;
6) after the switching preparation of the target eNB is completed, sending a switching REQUEST acknowledgement (HANDOVER REQUEST ACKNOWLEDGE) to the source eNB;
7) the source eNB sends RRC connection reconfiguration (RRCConnectionReconfiguration) to the terminal;
8) the source eNB sends SN STATUS TRANSFER (SN STATUS TRANSFER) to the target eNB;
9) the terminal sends RRC connection reconfiguration complete (RRCConnectionReconfiguration complete) to the target eNB;
10) the destination eNB sends a path switch REQUEST (PATH SWITCH REQUEST) to the MME;
11) the MME replies with a path switch REQUEST acknowledgement (PATH SWITCH REQUEST ACKNOWLEDGE) to the destination eNB;
12) the target eNB sends UE CONTEXT RELEASE (UE CONTEXT RELEASE) to the source eNB;
13) MME sends a bearer SETUP response (ERAB SETUP REQUEST) to the target eNB;
14) the target eNB sends RRC connection reconfiguration (RRCConnectionReconfiguration) to the terminal to establish DRB;
15) the terminal sends an RRC connection reestablishment request (RRCConnectionRelistmentRequest) to a target eNB;
16) the target eNB sends a bearer SETUP RESPONSE (ERAB SETUP RESPONSE) to the MME, and indicates that the ERAB bearer SETUP between the target base station and the terminal fails.
Therefore, when the ERAB bearer establishment and handover are concurrent, the prior art has the problems of high ERAB establishment failure rate, low service call completing rate, high reconstruction ratio and poor network quality.
Disclosure of Invention
In view of the foregoing problems, embodiments of the present invention provide a method for establishing a radio access bearer and a corresponding apparatus for establishing a radio access bearer.
In order to solve the above problem, an embodiment of the present invention discloses a method for establishing a radio access bearer, where the method is applied between a base station and a terminal, and the base station includes a source base station and a destination base station; the method comprises the following steps:
when the source base station fails to establish a wireless access bearer with the terminal, the target base station receives a switching request sent by the source base station; the version number of the communication protocol used by the switching request is higher than that used by the target base station;
the target base station returns a switching request confirmation signaling to the source base station; the source base station is used for sending a base station switching command to the terminal based on the switching request confirmation signaling;
the target base station initiates a request for establishing a wireless access bearer to the terminal; the terminal is used for establishing a wireless access bearer with the target base station according to the request for establishing the wireless access bearer;
and the target base station receives a feedback result of successful establishment of the wireless access bearer returned by the terminal.
Preferably, the step of failing to establish the radio access bearer between the source base station and the terminal includes:
after the source base station sends the radio resource control RRC connection reconfiguration signaling to the terminal, before the source base station receives the RRC connection reconfiguration completion signaling returned by the terminal,
and if the source base station receives a base station switching measurement report reported by the terminal, judging that the source base station and the terminal fail to establish the wireless access bearer.
Preferably, the handover request is generated as follows:
the source base station is used for generating a first switching request; the first switching request comprises the current communication protocol version number of the source base station;
the source base station is used for modifying the value of the current communication protocol version number of the source base station in the first switching request and generating a second switching request;
and taking the second switching request as a target switching request.
Preferably, the step of the destination base station returning the handover request acknowledgement signaling to the source base station includes:
the target base station generates fullconfig information according to the switching request;
and the target base station sends the fullconfig information to the source base station through a switching request confirmation signaling.
Preferably, the step that the source base station is configured to send a base station handover command to the terminal based on the handover request acknowledgement signaling includes:
the source base station is used for sending RRC connection reconfiguration signaling to the terminal; the RRC connection reconfiguration signaling comprises the fullconfig information and the wireless access bearing information of the target base station; and the terminal is used for deleting the wireless access bearing information of the source base station according to the fullconfig information.
Preferably, before the step of the destination base station initiating a request for establishing a radio access bearer to the terminal, the method further includes:
and the target base station receives the RRC connection reconfiguration finishing signaling returned by the terminal.
Preferably, the method further comprises:
and if the source base station receives a non-base station switching measurement report reported by the terminal, the source base station performs processing corresponding to the measurement report.
Correspondingly, the embodiment of the invention also discloses a device for establishing the wireless access bearer, which is applied to the base station, wherein the base station comprises a source base station and a target base station; the device comprises:
a receiving module located in the destination base station, configured to receive a handover request sent by the source base station when the source base station fails to establish a radio access bearer with the terminal; the version number of the communication protocol used by the switching request is higher than that used by the target base station;
a sending module located in the destination base station, configured to return a handover request acknowledgement signaling to the source base station; the source base station is used for sending a base station switching command to the terminal based on the switching request confirmation signaling;
the sending module is positioned at the target base station and is also used for initiating a request for establishing a wireless access bearer to the terminal; the terminal is used for establishing a wireless access bearer with the target base station according to the request for establishing the wireless access bearer;
and the receiving module is positioned at the target base station and is also used for receiving a feedback result of successful establishment of the wireless access bearer, which is returned by the terminal.
Preferably, the failure of the source base station to establish the radio access bearer with the terminal includes:
after the source base station sends a Radio Resource Control (RRC) connection reconfiguration signaling to the terminal, before the source base station receives an RRC connection reconfiguration completion signaling returned by the terminal, if the source base station receives a base station switching measurement report reported by the terminal, it is determined that the source base station and the terminal fail to establish a radio access bearer.
Preferably, the handover request is generated as follows:
a generating module located at the source base station, configured to generate a first handover request; the first switching request comprises the current communication protocol version number of the source base station;
the modification module is positioned in the source base station and used for modifying the value of the current communication protocol version number of the source base station in the first switching request and generating a second switching request;
and the determining module is positioned at the source base station and used for taking the second switching request as a target switching request.
Preferably, the sending module located in the destination base station includes:
the fullconfig information generating submodule is used for generating fullconfig information according to the switching request;
and the fullconfig information sending submodule is used for sending the fullconfig information to the source base station through a switching request confirmation signaling.
Preferably, the sending, by the source base station, the base station handover command to the terminal based on the handover request acknowledgement signaling includes:
a sending module located in the source base station, configured to send an RRC connection reconfiguration signaling to the terminal; the RRC connection reconfiguration signaling comprises the fullconfig information and the wireless access bearing information of the target base station; and the terminal is used for deleting the wireless access bearing information of the source base station according to the fullconfig information.
Preferably, the receiving module located in the target base station is further configured to receive an RRC connection reconfiguration complete signaling returned by the terminal before the target base station initiates the step of establishing the radio access bearer to the terminal.
The embodiment of the invention has the following advantages:
in the embodiment of the invention, when the source base station fails to establish the wireless access bearer with the terminal, the target base station receives the handover request sent by the source base station and returns a feedback result of handover preparation completion to the source base station, wherein the source base station is used for sending a base station handover command to the terminal based on the feedback result, and the target base station initiates the request for establishing the wireless access bearer to the terminal, wherein the terminal is used for establishing the wireless access bearer with the target base station according to the request for establishing the wireless access bearer, and the target base station receives the feedback result of successful establishment of the wireless access bearer returned by the terminal, so that the terminal deletes the existing bearer under the conditions of establishing ERAB and performing cell handover, and the bearer information of the target base station and the terminal is kept consistent according to the bearer processing in the handover command, so that the bearer can be established again successfully after the handover to the target base station, the situation that the ERAB flow needs to be reestablished from the beginning in the prior art is avoided, so that the ERAB establishing success rate and the service call-through rate are improved, and the network quality is improved.
Drawings
Fig. 1 is a flow chart of a conventional case processing of concurrently establishing an ERAB bearer and handover;
fig. 2 is a flowchart illustrating steps of an embodiment of a method for establishing a radio access bearer according to the present invention;
fig. 3 is a flow chart of processing the case of concurrently establishing the ERAB bearer and handover according to the present invention;
fig. 4 is a block diagram of an embodiment of an apparatus for establishing a radio access bearer according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 2, a flowchart of steps of an embodiment of a method for establishing a radio access bearer according to the present invention is shown, and the method is applied between a base station and a terminal, where the base station includes a source base station and a destination base station.
In this application, an Evolved Radio Access Bearer (ERAB) refers to an ERAB Bearer, and the ERAB refers to a Bearer of a User plane, and is used for transmitting voice, data, and multimedia services between a User Equipment (UE) and a Core Network (CN). The ERAB establishment is initiated by CN, when the ERAB establishment is successful, a basic service is established, and UE enters into the service using process. That is, the method described herein relates to a body including a terminal (i.e., UE), a source base station, a destination base station, and a CN.
For convenience of description, the base station before handover is referred to as a source base station, and the base station after handover is referred to as a destination base station. For example, the base station to which the terminal currently accesses is the a base station, and when the terminal enters a cell covered by the B base station, the terminal needs to access the B base station, so the a base station is called a source base station at this time, and the B base station is a destination base station.
In the embodiment of the present invention, the terminal may have the following characteristics:
(1) on a hardware architecture, a device has a central processing unit, a memory, an input unit and an output unit, that is, the device is often a microcomputer device having a communication function. In addition, various input modes such as a keyboard, a mouse, a touch screen, a microphone, a camera and the like can be provided, and input can be adjusted as required. Meanwhile, the equipment often has a plurality of output modes, such as a telephone receiver, a display screen and the like, and can be adjusted according to needs;
(2) on a software system, the device must have an operating system, such as Windows Mobile, Symbian, Palm, Android, iOS, and the like. Meanwhile, the operating systems are more and more open, and personalized application programs developed based on the open operating system platforms are infinite, such as a communication book, a schedule, a notebook, a calculator, various games and the like, so that the requirements of personalized users are met to a great extent;
(3) in terms of communication capacity, the device has flexible access mode and high-bandwidth communication performance, and can automatically adjust the selected communication mode according to the selected service and the environment, thereby being convenient for users to use. The equipment can support GSM, WCDMA, CDMA2000, TDSCDMA, Wi-Fi, WiMAX and the like, thereby being suitable for various systems of networks, not only supporting voice services, but also supporting various wireless data services;
(4) in the aspect of function use, the equipment focuses more on humanization, individuation and multi-functionalization. With the development of computer technology, devices enter a human-centered mode from a device-centered mode, and the embedded computing, control technology, artificial intelligence technology, biometric authentication technology and the like are integrated, so that the human-oriented purpose is fully embodied. Due to the development of software technology, the equipment can be adjusted and set according to individual requirements, and is more personalized. Meanwhile, the device integrates a plurality of software and hardware, and the function is more and more powerful.
The method specifically comprises the following steps:
In a specific implementation, the creation of the ERAB is initiated by the terminal, and after all, the user needs to transmit voice, data, and multimedia services, so that the terminal will initiate an ERAB creation request to an MME (mobile Management Entity) device of the CN only when the user has a need.
Certainly, the terminal cannot directly establish the ERAB with the core network, but needs the base station as a bridge, so in the process of establishing the ERAB with the core network, a Data bearer between the terminal and the base station (Data resource bearer, Data bearer between the terminal and the base station) needs to be established first.
Specifically, when receiving an ERAB establishment REQUEST initiated by a user, the MME sends a bearer establishment REQUEST (ERAB SETUP REQUEST) to the source base station, and after receiving the ERAB SETUP REQUEST signaling, the source base station sends an RrcConnectionReconfiguration signaling to the terminal to establish the DRB.
Under normal conditions, the rrcconnectionreconfiguration complete signaling source base station returned by the terminal can receive the signaling. However, in an actual scenario, when the source base station does not receive the rrcconnectionreconfiguration complete, and the terminal reports a measurement report to trigger cell handover due to a change in geographic location, an example of failure of establishing the ERAB between the terminal and the source base station may occur.
In a preferred embodiment of the present invention, the step of failing to establish the radio access bearer between the source base station and the terminal includes:
after the source base station sends a Radio Resource Control (RRC) connection reconfiguration signaling to the terminal, before the source base station receives an RRC connection reconfiguration completion signaling returned by the terminal, if the source base station receives a base station switching measurement report reported by the terminal, it is determined that the source base station and the terminal fail to establish a radio access bearer.
Specifically, after the source base station sends an rcconnectionreconfiguration signaling to the terminal, the terminal starts to establish an ERAB, and if the establishment is successful, the terminal returns an rcconnectionreconfiguration complete signaling to the source base station. That is, when the terminal successfully establishes the ERAB, it is prepared to send the rcconnectionreconfiguration complete signaling to the source base station, and as a result, the rcconnectionreconfiguration complete signaling is interrupted by the base station handover measurement report, so that the rcconnectionreconfiguration complete signaling is not reported to the source base station, but the measurement report is reported to the source base station, or the measurement report is reported but not received by the source base station.
At this time, the source base station needs to terminate the ERAB bearer establishment procedure and then perform mobility handover (base station handover). In this process, since the source base station does not wait for the rrcconnectionreconfiguration complete signaling fed back by the terminal, the source base station considers that the ERAB establishment procedure is failed, and therefore, the source base station may notify the core network that the ERAB establishment is failed, that is, the source base station may send an ERAB SETUP RESPONSE (FAIL) signaling to the MME.
The measurement report may include information such as a measurement object, report configuration, measurement identifier, quantity configuration, serving cell quality threshold control, and mobility state detection, and its role is mainly to determine whether the terminal needs to switch between the current cell and the neighboring cell by using the serving cell quality threshold control.
Generally, measurement reports include the following in several types:
event a1(Serving belows better than threshold): the quality of the signal of the service cell is higher than a certain threshold, and when the event meeting the condition is reported, the eNodeB stops the measurement of the different frequency/different system; similar to 2F events within UMTS;
event a2(Serving belongings word threshold): when the signal quality of the serving cell is lower than a certain threshold and an event meeting the condition is reported, the eNodeB starts the measurement of the pilot frequency/the pilot system; similar to 2D events within UMTS;
event A3 (neighbor books offset better than serving): the quality of the same-frequency adjacent cell is higher than that of the service cell, and when an event meeting the condition is reported, the source eNodeB starts a same-frequency switching request;
event A4 (neighbor books between the threshold): the quality of the pilot frequency adjacent cell is higher than a certain threshold, and when an event meeting the condition is reported, the source eNodeB starts a pilot frequency switching request;
event A5(Serving boiler threshold1 and neighbor boiler threshold 2): indicating that the quality of the service cell is lower than a certain threshold and the quality of the adjacent cell is higher than a certain threshold; similar to 2B events in UMTS;
event B1(Inter RAT neighbor tables greater than threshold): the quality of the adjacent cell of the different system is higher than a certain threshold, and when the condition event is reported, the source eNodeB starts a different system switching request; similar to the 3C event in UMTS;
event B2(Serving belows word threshold1 and inter RATNeighbour brand thresholds 2): indicating that the quality of the serving cell is below a certain threshold and the quality of the neighbor cells of the inter-system is above a certain threshold, similar to the 3A event for inter-system handover in UMTS.
In a preferred embodiment of the present invention, the communication protocol version number used by the handover request is higher than the communication protocol version number used by the destination base station;
the handover request is generated as follows:
the source base station is used for generating a first switching request; the first switching request comprises the current communication protocol version number of the source base station;
the source base station is used for modifying the value of the current communication protocol version number of the source base station in the first switching request and generating a second switching request;
and taking the second switching request as a target switching request.
Specifically, after receiving the measurement report of the base station handover, the source base station may first generate a first handover request, where the first handover request includes a communication protocol version number currently used by the source base station, and a field of the communication protocol version number is ue-configrule-r 9, and then add an integer to a value of the version number in the first handover request, for example, add 5, to generate a second handover request, and send the second handover request to the destination base station.
Of course, the value of the communication protocol version number currently used by the source base station may be directly added with an integer to generate the handover request, so that it is only necessary to generate a handover request.
In addition, regardless of the handover request generated by either of the two methods or by a method other than the two methods, the value of the communication protocol version number of the source base station in the handover request is larger than the value of the communication protocol version number actually used by the source base station. That is, the value of ue-configurea-r 9 in the Handover Request signaling is simply modified, and the protocol version is not actually used at the source base station. For example, the currently used communication protocol version of the source base station is R9, but the value of ue-configurea-R9 in the handover request sent by the source base station to the destination base station is 14.
And the function of modifying the communication protocol version number of the source base station in the handover request is to trigger fullconfig.
Specifically, the current source base station considers that the establishment of the ERAB is failed, and the source base station also sends a signaling indicating that the establishment of the ERAB is failed to the core network, but the terminal does not necessarily consider that the ERAB is failed, so when the terminal considers that the establishment of the ERAB is successful, the determination of the ERAB is inconsistent with the determination of the source base station and the determination of the core network. After the terminal is switched to the target base station, because the source base station fails to establish the ERAB with the terminal, the core network will continue to initiate the procedure of establishing the ERAB with the terminal again through the target base station, but because the terminal considers that the source base station and the terminal establish the ERAB successfully, the message of establishing the ERAB with the target base station will be considered illegal, so that the procedure of establishing the ERAB with the target base station and the terminal also fails, and finally the procedure of establishing the ERAB with the core network fails.
And triggering fullconfig requires the destination base station to consider that the version number of the communication protocol used by the source base station is higher than the version number of the communication protocol used by the destination base station, so that the value of ue-configrule-r 9 is modified in the Handover Request signaling sent by the source base station to the destination base station.
At present, the value of the largest ue-configurea-r 9 in the commercial network on the market, that is, the highest communication protocol version number is 12, so in practical application, when the value of ue-configurea-r 9 in the Handover Request signaling is modified, it is sufficient to directly modify the value to be greater than the largest ue-configurea-r 9 on the market, for example, the value of the added integer can be set to 4. Of course, the value of the added integer may be specifically set according to the actual situation, and the embodiment of the present invention is not limited to this.
In the embodiment of the present invention, the communication protocol may be a 3GPP protocol.
After receiving the second HANDOVER REQUEST sent by the source base station, the destination base station may prepare the access terminal, and after the destination base station completes the preparation, the destination base station may send a HANDOVER REQUEST ACKNOWLEDGE signaling to the source base station to inform the source base station that the preparation of the source base station itself is completed, and the access terminal may be accessed.
In a preferred embodiment of the present invention, the step of the destination base station returning a handover request acknowledgement signaling to the source base station includes:
the target base station generates fullconfig information according to the switching request;
and the target base station sends the fullconfig information to the source base station through a switching request confirmation signaling.
Specifically, after the source base station sends the switching request with the communication protocol with the high version number to the target base station, the target base station detects that the version number of the communication protocol in the switching request is higher than the version number of the communication protocol of the target base station, the switching request acknowledgement signaling returned to the source base station carries the fullconfig, and after the source base station receives the switching request acknowledgement signaling carrying the fullconfig, the fullconfig is retransmitted to the UE.
In a preferred embodiment of the present invention, the step that the source base station is configured to send a base station handover command to the terminal based on the handover request acknowledgement signaling includes:
the source base station is used for sending RRC connection reconfiguration signaling to the terminal; the RRC connection reconfiguration signaling comprises the fullconfig information and the wireless access bearing information of the target base station; and the terminal is used for deleting the wireless access bearing information of the source base station according to the fullconfig information.
When the source base station receives the HANDOVER REQUEST ACKNOWLEDGE signaling sent by the destination base station, it will send an rcconnectionreconfiguration signaling to the terminal, where the rcconnectionreconfiguration signaling includes fullconfiguration information and the radio access bearer information of the destination base station.
Because the terminal considers that the concurrent ERAB established by the terminal and the source base station is successful, when the terminal receives the rcconnectionreconfiguration signaling and finds that the signaling includes fullconfiguration information, the terminal deletes the information of currently establishing all the ERABs with the source base station, and establishes the ERAB with the target base station by using the radio access bearer information of the target base station in the rcconnectionreconfiguration signaling.
That is, the target base station and the radio access bearer information of the terminal are kept consistent by triggering the base station handover procedure containing the fullconfig message.
Meanwhile, the source base station sends SN STATUS TRANSFER signaling to the target base station, so that the target base station can transmit the data of the source base station, and the transmission is continued after synchronization.
In a preferred embodiment of the present invention, before the step of the destination base station initiating a request for establishing a radio access bearer to the terminal, the method further includes:
and the target base station receives the RRC connection reconfiguration finishing signaling returned by the terminal.
After the destination base station receives the SN STATUS TRANSFER signaling, the terminal sends rrcconnectionreconfiguration complete signaling to the destination base station instead of the source base station.
At this time, both the terminal and the destination base station know that the base station is switched, but the core network does not know, so that after receiving the rcconnectionreconfiguration complete signaling sent by the terminal, the destination base station needs to send PATH SWITCH REQUEST signaling to the core network to REQUEST the MME to update the node address of the service data channel, the MME successfully updates the node address of the data channel, and sends PATH switched acknowledgement signaling to the destination base station to indicate that service communication can be performed on the new data channel, at this time, the terminal has accessed a new cell, that is, the destination base station, and can perform service communication in the new cell, then, resources occupied by the source base station need to be released, so the destination base station sends UE context signaling to the source base station, and the source base station releases the context of the terminal according to the UE context signaling.
At this time, the MME may send an ERAB SETUP REQUEST signaling to the destination base station, i.e., the ERAB re-establishment REQUEST is requested. After receiving the ERAB SETUP REQUEST signaling, the destination base station may send an RrcConnectionReconfiguration signaling to the terminal to establish the DRB.
And step 204, the target base station receives a feedback result of successful establishment of the radio access bearer returned by the terminal.
After receiving the RrcConnectionReconfiguration signaling sent by the destination base station, the terminal may establish an ERAB. After the creation of the ERAB is completed, an rrcconnectionreconfiguration complete signaling is returned to the destination base station, and after the destination base station receives the signaling, the destination base station can consider that the creation of the ERAB is successful and send an ERAB SETUP RESPONSE signaling to the MME to indicate that the creation of the ERAB is successful.
In a preferred embodiment of the present invention, if the source base station receives a non-base station handover measurement report reported by the terminal, the source base station performs processing corresponding to the measurement report.
In practical applications, the measurement report reported by the terminal includes a measurement report for base station handover as well as other measurement reports, so in the present application, if the source base station receives a measurement report that is not for base station handover, the source base station performs processing corresponding to the measurement report.
Referring to fig. 3, a detailed description is made of a complete signaling flow diagram of the embodiment of the present invention, which includes the following steps:
1) the MME sends an ERAB SETUP REQUEST to the source eNB (Evolved Node B);
2) the source eNB sends RrcConnectionReconfiguration to the terminal to establish DRB;
3) the source eNB receives a MeasurementReport of the terminal;
4) the source eNB sends an ERAB SETUP RESPONSE (FAIL) to the MME to indicate that the ERAB bearer establishment FAILs;
5) the source eNB sends a HANDOVER REQUEST (with the value of ue-Configreal-r modified) to the destination eNB;
6) after the switching preparation of the target eNB is completed, sending a HANDOVER REQUEST ACKNOWLEDGE to the source eNB;
7) the source eNB sends RrcConnectionReconfiguration (containing fullconfig information) to the terminal;
8) the source eNB sends SN STATUS TRANSFER to the target eNB;
9) the terminal sends RrcConnectionReconfigurationcomplete to a target eNB;
10) the target eNB sends PATH SWITCH REQUEST to the MME;
11) MME replies PATH SWITCH REQUEST ACKNOWLEDGE to the target eNB;
12) the target eNB sends UE CONTEXT RELEASE to the source eNB;
13) MME sends ERAB SETUP REQUEST to the target eNB;
14) the target eNB sends RrcConnectionReconfiguration to the terminal to establish DRB;
15) the terminal sends RrcConnectionReconfigurationcomplete to a target eNB;
16) the target eNB sends an ERAB SETUP RESPONSE (SUCC) to the MME to indicate that the ERAB bearer is successfully established.
It should be noted that, the present application is only described in detail by taking the procedure of the X2 handover as an example, and in practical applications, the present application may also be applied to the procedures of intra-eNB handover, S1 handover, and the like, which is not described herein again.
In the embodiment of the invention, when the source base station fails to establish the wireless access bearer with the terminal, the target base station receives the handover request sent by the source base station and returns a feedback result of handover preparation completion to the source base station, wherein the source base station is used for sending a base station handover command to the terminal based on the feedback result, the target base station initiates the request for establishing the wireless access bearer to the terminal, the terminal is used for establishing the wireless access bearer with the target base station according to the request for establishing the wireless access bearer, and the target base station receives the feedback result of successful establishment of the wireless access bearer returned by the terminal, so that the terminal deletes the existing bearer in the handover command under the conditions of establishing ERAB and performing cell handover, and the bearer information of the target base station and the terminal is kept consistent according to the bearer processing in the handover command, so after the handover to the target base station, the re-establishment of the bearer can be successful, and the condition that the ERAB flow needs to be re-established from the beginning in the prior art is avoided, so that the success rate of establishing the ERAB and the service call-through rate are improved, and the network quality is improved.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Referring to fig. 4, a block diagram of a structure of an embodiment of an apparatus for establishing a radio access bearer according to the present invention is shown, which may specifically include the following modules:
a receiving module 401 located in the destination base station, configured to receive a handover request sent by the source base station when the source base station fails to establish a radio access bearer with the terminal; the version number of the communication protocol used by the switching request is higher than that used by the target base station;
a sending module 402 located in the destination base station, configured to return a handover request acknowledgement signaling to the source base station; the source base station is used for sending a base station switching command to the terminal based on the switching request confirmation signaling;
a sending module 402 located in the destination base station, further configured to initiate a request for establishing a radio access bearer to the terminal; the terminal is used for establishing a wireless access bearer with the target base station according to the request for establishing the wireless access bearer;
the receiving module 401 located in the destination base station is further configured to receive a feedback result that the radio access bearer is successfully established and returned by the terminal.
In a preferred embodiment of the present invention, the failure of the source base station to establish the radio access bearer with the terminal includes:
after the source base station sends a Radio Resource Control (RRC) connection reconfiguration signaling to the terminal, before the source base station receives an RRC connection reconfiguration completion signaling returned by the terminal, if the source base station receives a base station switching measurement report reported by the terminal, it is determined that the source base station and the terminal fail to establish a radio access bearer.
In a preferred embodiment of the present invention, the handover request is generated as follows:
a generating module located at the source base station, configured to generate a first handover request; the first switching request comprises the current communication protocol version number of the source base station;
the modification module is positioned in the source base station and used for modifying the value of the current communication protocol version number of the source base station in the first switching request and generating a second switching request;
and the determining module is positioned at the source base station and used for taking the second switching request as a target switching request.
In a preferred embodiment of the present invention, the sending module located in the destination base station includes:
the fullconfig information generating submodule is used for generating fullconfig information according to the switching request;
and the fullconfig information sending submodule is used for sending the fullconfig information to the source base station through a switching request confirmation signaling.
In a preferred embodiment of the present invention, the sending, by the source base station, a base station handover command to the terminal based on the handover request acknowledgement signaling includes:
a sending module located in the source base station, configured to send an RRC connection reconfiguration signaling to the terminal; the RRC connection reconfiguration signaling comprises the fullconfig information and the wireless access bearing information of the target base station; and the terminal is used for deleting the wireless access bearing information of the source base station according to the fullconfig information.
In a preferred embodiment of the present invention, the receiving module located in the destination base station is further configured to receive an RRC connection reconfiguration complete signaling returned by the terminal before the destination base station initiates the step of establishing the radio access bearer to the terminal.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The method for establishing a radio access bearer and the apparatus for establishing a radio access bearer provided by the present invention are introduced in detail above, and a specific example is applied in the text to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (7)
1. A method for establishing a radio access bearer is characterized in that the method is applied between a base station and a terminal, wherein the base station comprises a source base station and a target base station; the method comprises the following steps:
when the establishment of the evolved wireless access bearer is concurrent with the switching, which causes the failure of establishing the evolved wireless access bearer between the source base station and the terminal, the target base station receives a switching request sent by the source base station; the version number of the communication protocol used by the switching request is higher than that used by the target base station;
the target base station returns a switching request confirmation signaling to the source base station; the source base station is used for sending a base station switching command to the terminal based on the switching request confirmation signaling;
the target base station initiates a request for establishing an evolved wireless access bearer to the terminal; the terminal is used for establishing an evolved wireless access bearer with the target base station according to the evolved wireless access bearer establishing request;
the target base station receives a feedback result of successful establishment of the evolved wireless access bearer returned by the terminal;
the step that the target base station returns the switching request confirmation signaling to the source base station comprises the following steps:
the target base station generates fullconfig information according to the switching request;
the destination base station sends the fullconfig information to the source base station through a switching request confirmation signaling;
the step that the source base station is used for sending a base station switching command to the terminal based on the switching request confirmation signaling comprises the following steps:
the source base station is used for sending RRC connection reconfiguration signaling to the terminal; the RRC connection reconfiguration signaling comprises the fullconfig information and the evolved wireless access bearing information of the target base station; and the terminal is used for deleting the evolved wireless access bearing information of the source base station according to the fullconfig information.
2. The method of claim 1, wherein the failure of the source base station to establish the evolved radio access bearer with the terminal comprises:
after the source base station sends a Radio Resource Control (RRC) connection reconfiguration signaling to the terminal, before the source base station receives an RRC connection reconfiguration completion signaling returned by the terminal, if the source base station receives a base station switching measurement report reported by the terminal, it is determined that the source base station and the terminal fail to establish an evolved radio access bearer.
3. The method of claim 1, wherein the handover request is generated by:
the source base station is used for generating a first switching request; the first switching request comprises the current communication protocol version number of the source base station;
the source base station is used for modifying the value of the current communication protocol version number of the source base station in the first switching request and generating a second switching request;
and taking the second switching request as a target switching request.
4. The method according to claim 1, wherein before the step of the destination base station initiating a request for establishing an evolved radio access bearer to the terminal, the method further comprises:
and the target base station receives the RRC connection reconfiguration finishing signaling returned by the terminal.
5. An apparatus for establishing a radio access bearer, the apparatus being applied to a base station, the base station comprising a source base station and a destination base station; the device comprises:
the receiving module is positioned at the target base station and used for receiving the switching request sent by the source base station when the establishment and the switching of the evolved wireless access bearer are concurrent, so that the establishment of the evolved wireless access bearer between the source base station and the terminal fails; the version number of the communication protocol used by the switching request is higher than that used by the target base station;
a sending module located in the destination base station, configured to return a handover request acknowledgement signaling to the source base station; the source base station is used for sending a base station switching command to the terminal based on the switching request confirmation signaling;
the sending module is positioned at the target base station and is also used for initiating a request for establishing an evolved wireless access bearer to the terminal; the terminal is used for establishing an evolved wireless access bearer with the target base station according to the evolved wireless access bearer establishing request;
the receiving module is positioned at the target base station and is also used for receiving a feedback result of successful establishment of the evolved wireless access bearer, which is returned by the terminal;
the sending module located in the destination base station includes:
the fullconfig information generating submodule is used for generating fullconfig information according to the switching request;
a fullconfig information sending submodule, configured to send the fullconfig information to the source base station through a handover request acknowledgement signaling;
the source base station is configured to send a base station handover command to the terminal based on the handover request acknowledgement signaling, including:
a sending module located in the source base station, configured to send an RRC connection reconfiguration signaling to the terminal; the RRC connection reconfiguration signaling comprises the fullconfig information and the evolved wireless access bearing information of the target base station; and the terminal is used for deleting the evolved wireless access bearing information of the source base station according to the fullconfig information.
6. The apparatus of claim 5, wherein the failure of the source base station to establish the evolved radio access bearer with the terminal comprises:
after the source base station sends a Radio Resource Control (RRC) connection reconfiguration signaling to the terminal, before the source base station receives an RRC connection reconfiguration completion signaling returned by the terminal, if the source base station receives a base station switching measurement report reported by the terminal, it is determined that the source base station and the terminal fail to establish an evolved radio access bearer.
7. The apparatus of claim 5, wherein the handover request is generated by:
a generating module located at the source base station, configured to generate a first handover request; the first switching request comprises the current communication protocol version number of the source base station;
the modification module is positioned in the source base station and used for modifying the value of the current communication protocol version number of the source base station in the first switching request and generating a second switching request;
and the determining module is positioned at the source base station and used for taking the second switching request as a target switching request.
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